Question

Tinh gia tri bieu thuc A = 5/1.2 + 5/2.3 +...+ 5/99.100

Answer 1

A = 5/1.2 + 5/2.3 +...+ 5/99.100

 2A = 10/1.2 + 10/2.3 +...+ 10/99.100

2 A = 5/1-5/2+5/2-5/3+5/3-5/4+...+5/99-5/100

2A=5/1-5/100

2A=9/2 => A=9/2:2=9/4

cho 1 đ-ú-n-g nha bạn!!

Answer 2

99/20 đảm bảo

lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

Answer 3

Kẻ Bí Mật sai rồi !                                                                                      

Answer 4

to cung ca voi cau la 99/20 sai lam cua cau la chon cau tra loi dau tien